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$\text{Group I}$ lists a set of four transfer functions. $\text{Group II}$ gives a list of possible step responses $y(t)$. Match the step responses with the corresponding transfer functions.

$\textbf{Group I}$
$P=\frac{25}{s^{2}+25} \quad Q=\frac{36}{s^{2}+20 s+36} \quad R=\frac{36}{s^{2}+12 s+36} \quad S=\frac{49}{s^{2}+7 s+49}$

$\textbf{Group II}$

1. $\text{P-3, Q-1, R-4, S-2}$
2. $\text{P-3, Q-2, R-4, S-1}$
3. $\text{P-2, Q-1, R-4, S-3}$
4. $\text{P-3, Q-4, R-1, S-2}$